bind9 @9.18.21: Outdated configure compile options

[wfburton]

Any chance to rework the build to not replace named.conf if it already exists. Also, in the PortFile I believe dlopen is no longer a configure option. Can't say in what version of BIND9 it was dropped. Also, should I be concerned that there is no named file lock file.

MacOS X Leopard PPC 10.5.8

barracuda156 fixed jemalloc to compile bind9 without it. Got his fixes and just waiting for it to upstream and merge to base.

I'm submitting this to further enhance the build and also I'm not sure what the ramification are of not having a named file lock file.

default paths:
  named configuration:  /opt/local/etc/named.conf
  rndc configuration:   /opt/local/etc/rndc.conf
  DNSSEC root key:      /opt/local/etc/bind.keys
  nsupdate session key: /opt/local/var/run/named/session.key
  named PID file:       /opt/local/var/run/named/named.pid
  named lock file:      /

Thank you in advance!